Portable battery booster



FIG. 1 is a front plan view of the portable battery booster of the present invention;

FIG. 2 is a back plan view of the portable battery booster of FIG. 1;

FIG. 3 is a left side plan view of the portable battery booster of FIG. 1;

FIG. 4 is a right side plan view of the portable battery booster of FIG. 1;

FIG. 5 is a top plan view of the portable battery booster of FIG. 1; and,

FIG. 6 is a bottom plan view of the portable battery booster of FIG. 1. 

The ornamental design for a portable battery booster, as shown. 